Apparently, six men who tried to steal the expensive SUV of former light welterweight champion Amir Khan, 25, and his 20-year-old brother Haroon (also a boxer) on Monday in Birmingham, England, discovered firsthand why you don't mess with men who hurt people for a living.

According to The Sun, the assailants, or "Yobs," as the Brfitish newspaper described them, used an SUV to try to block the Khans from getting to Amir's Range Rover early Monday morning. At that point, according to The Sun, Amir and Haroon decided to fight back.

Here's one eyewitness's account, according to The Sun, of what happened: "These guys tried to jump Amir and his brother but they picked on the wrong blokes. They parked their car in front of the Range Rover. At least one had a cosh (weapon). One slapped Amir and clipped him on the lip but Amir pulled back and knocked him out cold. Then five of them went for Amir and Haroon - but they stood their ground and these guys got dropped one by one. They left these men with cuts and bruises but all they were doing was defending their property."

According to The Sun, the fighters then fled as the assailants broke the rear window of the Range Rover.

The Sun said, "Police last night confirmed they were called out after reports of a fight. But a spokesman added: 'Nobody came forward.' "

Khan's father, Shah, told the Birmingham Mail he was not happy that his sons fought back. "You should walk away, turn away. It takes a bigger man to not get involved," Shah Khan told the newspaper. "But they are OK and everyone is OK."

Khan's promoter, Golden Boy Promotions, held a press conference Tuesday with the fighter in London to announce Khan's next fight against Carlos Molina.